Short-circuit switch



March 9 1926. 1,575,732

' F. H. BACHMAN SHORT CIRCUIT SWITCH Filed Feb. 21, 1924 ATTORNEY pspecification.

Q s e ted Mir. 9', 1925.

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Application and February an, 1924. Serial m. 094,401.

, To all whom'it may 001mm: v

. Be it known that I FAYETTE H. BAGHMAN,

a citizen of the United States, residing at Oakland, in the county ofAlameda and State of California, have invented certain new and;'j---c'uit Switches, of which the following is a My invention is ashort circuit switch for telephone transmitter circuits.

The object of my invention is to provide; a switch in the telephonetransmitter circuit,

which may be rea 'ly operated by the user of the telephone. Anotherobject is to provide a switch which will short circuit the transmitterand enable the user to carry on an inde endent rivate conversation. Alsolocal noises will e eliminated. from the receiver. A further object isto provide a switch which may be readily attached to a receiver, andwhich is simple in construction and inexpensive to manufacture.

I My'short circuit switch is enclosed in a small cup and is of the pushbutton type. In

2 the cup I mount a small condenser parallel with the switch and extendlead wires to the transmitter circuit. A simple conduit extends from thecup and has two spring arms which are constructed of proper size to en-80 gage the ordinary commercial telephone receiver. In this manner theswitch is placed on the receiver, but as a separate attachment and in aconvenient position to be operated by the telephone user in order tobreak the transmitter circuit for the purposes above described.

In the annexed drawing in which my invention is illustrated, I haveshown the preferred form, but it may also be embodied in other forms,and in this application I desire to cover my invention in whatever formit may be embodied.

' Fig. 1 is aside view of my switch secured to a telephone receiver,

Fig. 2 isf'a sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a wiring diagram of my switch.

Referring more particularly to the drawing, my switch comprises a cup 1,and a 6011." duit 2 extending from said cup, and adaptp ed to lie alongthe side of the telephone receiver Basshown mFIg: 1. The end. of the 111Improvements in Short-Gin oeiver to hold the conduit in place.

A switch button 4 of any desired type is positioned in the cup 1, andconnected across the two leads of the receiver circuit 5, so that whentheswitch is closed the receiver will be short circuit'ed. and out ofoperation.

Toeliminate the click caused by closing the switch 4 a condefiser 6 isconnected in parallel with the said switch. This condenser is alsoplaced in the cup 1, thus forming a compact structure.

" The cup 1 and conduit 2 are secured to the receiver 3 by a pair ofspring arms 7 and 8, suitably secured thereto, and encircling saidreceiver. The wires from the switch 4 extend through the conduit 2 andextend to the transmitter.

My short circuit switch may be considerably modified tosuit difierenttypes of re ceivers and could readily be adapted for a holder havingboth the receiver and transmitter in the same mounting. The conduit 2and clips7 and 8 can be changed to suit difl'erent types of telephoneimplements, or

the short circuit switch may be mounted as a separate desk attachmentHaving described my invention I claim: 1. A. short circuit switch in atelephone transmitter circuit comprising a cup, a conduit extending fromsaid cup and a push button switch in said cup the leads of which extendto the transmitter leadsthrough said conduit and means to secure saidcup and conduit to the telephone receiver.

2. A short circuit switch in a. telephone transmitter circuit comprisinga cup, a conduit extending from said cup and a push button switch insaid cup the leads of which extend to the transmitter leads through saidconduit and spring arms secured to said conduit and adapted to encirclethe receiver.

3. A short circuit switch in a telephone transmitter circuit comprisinga cup, a conduit extending from said cup, a push button switch in thecup, a condenser mounted in the said cup and connected in parallel withthe switch, the leads of which extend to the transmitter leads throughsaid conduit and s ringarms secured to said conduit and a apted toencircle a receiver.

4;. A h rt circuit swit h 111 a tel ph ne a conduit .2 extends over theend of the re- V transmitter circuit comprising a cup, a a telephonetransmitter circuit, a cup shaped switch mounted therein, a condenser inthe device having an aperture for a push butcup connected in parallelwith the switch, ton, an elongated U-shaped trough adapted leadstherefrom to the transmitter leads, a to form a conduit for wires and aplurality 5 framing supporting the cup and spring clips of spring clipsattached to the conduit thereon adapted to attachthe cup to ateleadapted to be secured to a telephone receiver. phone receiver. Intestimony whereof I aflix my signature.

'5. In a short circuit switch, adapted for FAYETTE H. BACHMAN.

